Fabrication of new Mn-based MXene structure from MnO2 for electrochemical energy storage applications

• Published in: Monatshefte für Chemie Vol. 155; no. 3-4; pp. 289 - 297
• Main Authors: Eraky, Mostafa S., El-Sadek, Mohamed, Shenouda, Atef Y., Sanad, Moustafa M. S.
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.04.2024; Springer Nature B.V
• Subjects: Aluminum oxide; Analytical Chemistry; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Electrochemical impedance spectroscopy; Energy storage; Heat treatment; Inorganic Chemistry; Leaching; Lithium; Magnetic separation; Manganese dioxide; Mixtures; MXenes; Organic Chemistry; Original Paper; Particle size distribution; Physical Chemistry; Theoretical and Computational Chemistry; Two-dimensional materials; Lithium-ion batteries; Mechanical activation; MXene
• ISSN: 0026-9247; 1434-4475
• DOI: 10.1007/s00706-024-03173-9

MXene compound of Mn 7 C 3 was successfully prepared using combined mechanical, thermal, and leaching processes. A mixture of MnO 2 , Al, and black C with stoichiometric ratios 3:5:2 was mechanically activated in the ball mill for 5 h. Thermal treatment at 1000 °C was applied to this mixture. Magnetic separation was used to separate Mn 3 AlC 2 from Al 2 O 3 . After that, Al was leached from Mn 3 AlC 2 using 15% HF. SEM investigation indicated the formation of Mxene (Mn 7 C 3 ) particles as aligned sheet-like structure and particle size distribution range of 110–145 nm. The obtained MXene compounds were used as an active material vs. lithium metal and assembled in a coin cell. The electrochemical assessment of this cell was carried out using galvanostatic cycling, electrochemical impedance spectroscopy, and cyclic voltammetry techniques. MXene (Mn 7 C 3 ) cell showed better performance with charge capacity by preserving about 150 mAh g −1 after 100 cycles. The coulombic efficiency of the cell is approaching 99.2% after long cycles. Graphical abstract